By understanding what each option do, you can decide which options are suitable for a particular
installation.

For instance, Maint Cleanup can be critical if you also do backup and don't have other means to
remove old backup files.

Or, Reorg can be important to reduce fragmentation, but since the maint plan's reorg is stupid and
don't take into account initial fragmentation one might want to skip this step and do it yourself
(smarter). Or perhaps not at all, if fragmentation don't cost you.

etc...